This means that 1048576 bytes are allocated from the tablespace
for this table on each partition, of which 1044440 bytes remain
free for additional storage. In other words, 1048576 - 1044440 =
4136 bytes per partition is currently being used to store the
data from this table's disk-based columns. The number of
bytes shown as Free extent_space is available
for storing on-disk column data from the fish
table only; for this reason, it is not visible when selecting
from the INFORMATION_SCHEMA.FILES
table.

Include information about the mappings between table
partitions and the data nodes upon which they reside. This
information can be useful for verifying distribution
awareness mechanisms and supporting more efficient
application access to the data stored in MySQL Cluster.